|
Income Taxes (Unrecognized tax benefits) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns, Net [Roll Forward] | ||
| Balance at January 1 | $ 7 | $ 5 |
| Additions for tax positions of prior years | 0 | 2 |
| Balance at December 31 | $ 7 | $ 7 |